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CVE-2025-38257

7.3 · HIGH

In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Prevent overflow in size calculation for memdup_user() Number of apqn target list entries contained in 'nr_apqns' va…

Published Jul 9, 2025EPSS 0.18%

Overview

CVE-2025-38257 is a high-severity vulnerability. It was published on July 9, 2025 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

s390/pkey: Prevent overflow in size calculation for memdup_user()

Number of apqn target list entries contained in 'nr_apqns' variable is

determined by userspace via an ioctl call so the result of the product in

calculation of size passed to memdup_user() may overflow.

In this case the actual size of the allocated area and the value

describing it won't be in sync leading to various types of unpredictable

behaviour later.

Use a proper memdup_array_user() helper which returns an error if an

overflow is detected. Note that it is different from when nr_apqns is

initially zero - that case is considered valid and should be handled in

subsequent pkey_handler implementations.

Found by Linux Verification Center (linuxtesting.org).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/73483ca7e07a5e39bdf612eec9d3d293e8bef649Refgit.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489Refgit.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05Refgit.kernel.org/stable/c/ad1bdd24a02d5a8d119af8e4cd50933780a6d29fRefgit.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16Refgit.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148cReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38257?

CVE-2025-38257 is a high-severity vulnerability. It was published on July 9, 2025 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2025-38257?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38257?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38257?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38257 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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